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ENVIRONMENTAL QUALITY: The degree to which the naturally occurring resources of the planet (land, air, and water) are free of artificial impurities or waste products generated by human activity. Pollution is the primary nemesis of environmental quality. As pollution waste residuals are discharged into the environment, environmental quality declines. Like other economic notions, environmental quality is subjective in the sense that it affects the satisfaction of wants and needs.

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MARGINAL REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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Today, you are likely to spend a great deal of time watching the shopping channel looking to buy either throw pillows for your living room sofa or a hepa filter for your furnace. Be on the lookout for jovial bank tellers.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"And while the law of competition may be sometimes hard for the individual, it is best for the race, because it ensures the survival of the fittest in every department. "

-- Andrew Carnegie, entrepreneur

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